Wilderness Ethics – Laura & Guy Waterman
Two in the Far North - Mardie Murie
Refuge – Terry Tempest Williams
Northern Farm – Henry Beston
Small Wonder - Barbara Kingsolver
Riverwalking -- Reflections on Moving Water - Kathleen Dean Moore.
Red - Terry Tempest Williams
Ishmael - Daniel Quinn
Practice of the Wild - Gary Snyder
The Lost Grizzlies - Rick Bass
The Book of Yaak - Rick Bass
The Trail Home - John Daniel
Green Was the Earth on the Seventh Day - Thor Heyerdahl
On the Loose - Terry and Renny Russell
Halfway Man - Wayland Drew
In The Shadow of a Rainbow - Robert Franklin Leslie
The Bears and I - Robert Franklin Leslie

A Wilderness Book Shelf would not be complete without Ed Abbey. These are my favorite of Abbey's works:

Voice of the Earth - Michael Tobias
The River Why - David James Duncan
The Grizzly Years - Doug Peacock
Pilgrim at Tinker Creek - Annie Dillard
The Thousand Mile Summer - Colin Fletcher
The Man Who Walked Through Time - Colin Fletcher
Siddhartha - Hermann Hesse
Everst The West Ridge - Thomas F. Hornbein
The Journals of Lewis and Clark- Meriwether Lewis
In The Spirit of Crazy Horse - Peter Matthiessen
At Play In The Fields of the Lord - Peter Matthiessen
The Snow Leopard - Peter Matthiessen
Sea of Slaughter - Farley Mowat
Never Cry Wolf - Farley Mowat
People of the Deer - Farley Mowat
The Snow Walker - Farley Mowat
A Woman's Journey - Cindy Ross
Everett Ruess - W.L. Rusho
Journal of a Trapper - Osborne Russell
Turtle Island - Gary Snyder
In the Shining Mountains - David Thomson
Alaska Wilderness - Bob Marshall (formerly titled "Arctic Wilderness")
An Unspoken Hunger - Terry Tempest Williams
The Long Walk - Slavomir Rawicz